I have Sigma 70mm 2.8 Macro and it is as sharp as Sigma 35mm 1.4 Art in the center and sharper on the corners. I have 3 other sharp lenses (Nikon 135mm DC F2, Nikon 85mm 1.8G and Nikon 50mm 1.8G) , but they are nowhere near these 2 Sigmas in sharpness. I compared all lenses at F5.6 in 3 occasions and results are consistent. Good day!